<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h2{
            color: lawngreen;
        }
    </style>
    <link rel="stylesheet" href="My.css">
</head>
<body>
<h1 style="color: lightblue">内联式</h1>
<h1 style="color: lightseagreen">内联式</h1>
<h2>艾肯声卡觉得</h2>
<h2>艾肯声卡觉得</h2>
<h2>艾肯声卡觉得</h2>
<h3>外部样式</h3>
<h3>外部样式</h3>
<h3>外部样式</h3>
<h3>外部样式</h3>
</body>
</html>